Simple algebra 2 help?

Question

1.) The numerator of a fraction is 6 less than its denominator, and the value of the fraction is 3/5.

2.) Tom & Tina set out on their bikes at noon & travel towards each other, meeting at 3:20 pm. Tina's speed is 4 mi/h faster than Tom's speed & their starting point are 50 mi apart.

3.) A grocer mixed cashews & almonds to produce 20kg of mixed nuts worth $7.80/kg. Cashews are worth $7/kg, & almonds are worth $9/kg.

Answer 1

(n - 6) / n = 3 / 5

5n - 30 = 3n

2n = 30

n = 15, so the fraction is 9/15

50 miles / (m + m+4) mi/hr = 3 1/3 hr

50 / (2m + 4) = 10/3

20m + 40 = 150

20m = 110

m = 5.5 mph (Tom), m+4 = 9.5 mph (Tina)

I did the third one in a previous question.

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